He told them he wanted them to hear it from him, but didn't want their sympathy because it was time wasted when they could be making music. He didn't want to become the media's 'poster boy' for AIDs, which is true to life. Freddie only revealed his plight publicly on November 23, 1991, the day before he passed.
Edit (Coming Soon)

Most singing scenes in the movie rely on either vocal stems from Queen master tapes or new recordings by Marc Martel, a Canadian Christian rock singer whose voice is practically identical to the late frontman's.
Rami's voice is also mixed into the vocals too
Edit (Coming Soon)